Improvement in water-heaters for steam-boilers



` NFETERS. PHOYO-LITHOGRAPHER WASHINGTON D C y acta sate y DAvID o. c. FIELD, or LownLL, MASSAoHIISnT'rS.

Letters Patent No. 111,526, dated February 7,1871.

IMPROVEMENT 1N wA'rER-HEATERS FoR STEAM-Bodens.

The Schedule referred to in these-Letters Patent and making part of the same.

I, DAVID C. G. FIELD, `of Lowell, in the county of Middlesex and Commonwealth of. Massachusetts, have invented certain Improvements in Water-Heat ers connected with Steam-Boilers, of which the following is a specification.

My invention relates to the construction and arrangement of a water-heater in connection with a steam-boiler, exhaust steam from the engine, and brick-tine, "in such a manner that the cold water pumped directly from the well or tank is transmitted to the boiler in a highly heated condition, causing a great saving in the amount of fuelwand labor necessary to generate steam, rendering`the ,boilers less liable to injury from sudden contraction and expansion iu consequence-of the admission of hot instead of cold water, and the'pump less liable to get out of order in pumping cold instead of hot water.

I amenabled, owing to the peculiar construction and arrangement of my heating apparatus, to so utilize the waste heat from the furnace, and the exhaust steam from the engine, to lessen the cost of generating steam fully one-halt` over the ordinary method of pumping cold waterinto the boiler.

rljhe exhaust steam from the engine, in passing through the pipes or tubes ofthe heater, is condensed to a certain extent by the cold water pumped into the heater, which hasthe eiiect of 'producing a partial vacuum in the exhaust-pipe of the Iengine, and is equivalent to an increased pressure of direct steam acting on' the pist-on, thus increasing the power of the engine.A y A lhe boiler-plates, which come directly over the lire, are frequently cracked or warped by the sudden contraction caused by the injection of cold water into the boiler upon the heated plates, and from this'canse,

especially in the case oi'- old boilers, often arise disastrous explosions.

By my improved apparatus this danger' is avoided, as the water enters the boiler in a condition nearly as hot as that already in the boiler, and this is accomplished without any extra fuel or cost ot' any kind other than the first cost of the apparatus. v

The exhaust steam from the engine is frequently employed to heat water in a cistern preparatory to its introduction into the boiler by means of fthe force-v pump ordinarily employed. This method oflieating the water and forcing the same into the boiler is often productive of great injury to the pump, in consequence of the heat acting Vupon the valves and deranging vthe same. This injury to the pump is entirely avoided bymy invention.

Figure 1 is a side View of my invention, showing the arrangement o f the heater and pipes connected with the same, as also a break in the brick-work surroundingthe boiler, showing the position "of the flue in connection with the heater, and the manner of introducing the exhaust steam into said heater.

Eignre 2 is an end view of my inyention,showing, through the broken boiler-front, the frontend of the lne, and also of the heater with a portion of the front end of the heater bmken from the same, showing the chamber at this end, which is identical with the chamber at the other end of the heater, and the arrangement of the pipes or tubes ofthe heater and the passage-way from the boiler-tubes tothe ilue, within and over which the heater isplaced.'

rEhe same letters in both ignres represent corres' ponding parts.

Ais a steam tubular boiler, of the ordinary construction, iuclosed in brick walls. l

Bis the heater, constructed of boiler-iron.

' A chamber is formed at veach end of the heater, inside, by the introduction of a round plate of iron, b, riveted at a suitable 'distance from the outside plate; said plates have four or more holes for the reception of the tubes, as represented, and to which plates the tubes are iirmly welded, the object of said tubes being to receive the exhaust steam from the engine and conduct it through the heater,pinto which cold water is introduced through the pipe C, said pipe being conconnected to pump D.

E is the pipe which conveys the exhaust steam from the engine to the heater.

F is a pipe which conveys away the exhaust steam after it has passed the heater.

G is the brick flue, within and over which is placed the heater. i

H is a pipe through which the water-,after being heated, is forced b'y the pump into the boiler at the T h.

I is a pipe for conveying away the condensed steam or water in the chamber of the heater; this pipe connects with the blow-ofi' pipel M of the boiler.

J is a hand-hole, which enters the chamber and the water portion of the heater, by inea-ns of which anything collecting in said heater may be removed.

K is a pipe, whichA is the connection of the brick line with the chimney'.

Lis a safety-valve, by means of which all danger `o n account of an over-pressure of water in the heater is avoided.

N N are the chambers formed in the heater.

The wateriv is introdncedinto the heater through the ypipe C, and, by means of the exhaust steam from the engine and all of the heat that has passed the boiler, thewater is heated and conveyed into the boiler through the pipeH.

4The smoke and gases produced by the combustion ofthe fuel pass through the brick iue G to the Chim'- ney.

I claim as my invention 1. The position ofthe heatei'in and over the boiler- Hue, in order that the advantage of the use of the exhaust steam may be combined with the use of the heat which has passed the boiler and would go to the chimney if not thus utilized as described.

2. rlhe combination and arrangement of the heater B-with the boiler A, (said heater being placed overl and within the ue` G,) and the pipes connected therewith, substantially as described and for the purpose specied. A V

DAVID C. G. FIELD.

Witnesses:

ALBERT M; MOORE, ABEL T. ATHERTON. 

